subrip hardsubs

[kharan5876]

I'm getting an error message when trying to rip hardsubs from an avi

First it asks me if I want to edit the avs script. I just leave the defaults:
OpenDMLSource("I:\torrents\movie.avi", false)
ConvertToRGB24()


I was trying to rip hardsubs from an avi. Upon loading the avi I get a popup with this error:
No suitage compressor could be found to give RGB32 images.
If the video does not appear in the video window, recompress.

After that when the video loads in the video window I just see black with red text thats cuts off but says:
couldn't locate a decompressor for fourcc divx
C:\program Files\subrip_1.50_beta3a\temp.avs line).

Is there some ffdshow setting or avs plugin I need to add or change?
This is a divx encoded avi.

[ai4spam]

SubRip needs RGB24 images. Try installing DivX instead of ffdshow, or using VirtualDub to recompress the movie to XViD.
Alternatively, there may be some AviSynth function to transfer YUV to RGB, look it up and put it in the script.